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Table 4 Transformation of VLT-I subtest scores

From: The screen for cognitive impairment in psychiatry: diagnostic-specific standardization in psychiatric ill patients

< Secondary school

≥ Secondary school

18-39

40-55

18-39

40-55

PD

P

z

T

IQ

PD

P

z

T

IQ

PD

P

z

T

IQ

PD

P

z

T

IQ

0-11

< 3

< −1.72

< 33

< 74

0-9

1

< −2.19

< 28

< 67

0-5

1

< −3.45

< 16

< 48

0-9

1

< −2.4

< 26

< 64

0-11

< 3

< −1.72

< 33

< 74

0-9

1

< −2.19

< 28

< 67

6

1

−3.45

16

48

0-9

1

< −2.4

< 26

< 64

0-11

< 3

< −1.72

< 33

< 74

0-9

1

< −2.19

< 28

< 67

7

1

−3.21

18

52

0-9

1

< −2.4

< 26

< 64

0-11

< 3

< −1.72

< 33

< 74

9

1

−2.19

28

67

8

1

−2.96

20

56

0-9

1

< −2.4

< 26

< 64

0-11

< 3

< −1.72

< 33

< 74

10

2

−1.93

31

71

9

1

−2.72

23

59

10

1

−2.4

26

64

0-11

< 3

< −1.72

< 33

< 74

11

5

−1.67

33

75

10

1

−2.48

25

63

11

2

−2.14

29

68

12

3

−1.72

33

74

12

9

−1.41

36

79

11

3

−2.24

28

66

12

3

−1.89

31

72

13

9

−1.45

35

78

13

15

−1.15

39

83

12

4

−1.99

30

70

13

5

−1.63

34

76

14

13

−1.18

38

82

14

22

−0.89

41

87

13

5

−1.75

33

74

14

9

−1.37

36

79

15

19

−0.9

41

86

15

28

−0.62

44

91

14

8

−1.51

35

77

15

15

−1.12

39

83

16

30

−0.63

44

91

16

33

−0.36

46

95

15

10

−1.26

37

81

16

22

−0.86

41

87

17

43

−0.36

46

95

17

44

−0.10

49

98

16

14

−1.02

40

85

17

28

−0.61

44

91

18

51

−0.08

49

99

18

56

0.16

52

102

17

19

−0.78

42

88

18

36

−0.35

46

95

19

57

0.19

52

103

19

64

0.42

54

106

18

26

−0.54

45

92

19

46

−0.10

49

99

20

63

0.46

55

107

20

72

0.68

57

110

19

37

−0.29

47

96

20

54

0.16

52

102

21

70

0.73

57

111

21

81

0.94

59

114

20

47

−0.05

49

99

21

61

0.41

54

106

22

80

1.01

60

115

22

89

1.20

62

118

21

56

0.19

52

103

22

73

0.67

57

110

23

88

1.28

63

119

23

94

1.47

65

122

22

66

0.43

54

107

23

82

0.93

59

114

24

94

1.55

66

123

24

97

1.73

67

126

23

75

0.68

57

110

24

88

1.18

62

118

25

98

1.83

68

127

25

98

1.99

70

130

24

82

0.92

59

114

25

94

1.44

64

122

26-30

99

> 1.83

> 68

> 127

26

99

2.25

72

134

25

87

1.16

62

117

26

96

1.69

67

125

26-30

99

> 1.83

> 68

> 127

27

99

2.51

75

138

26

93

1.41

64

121

27

98

1.95

69

129

26-30

99

> 1.83

> 68

> 127

28-39

99

> 2.51

> 75

> 138

27

97

1.65

66

125

28

99

2.20

72

133

26-30

99

> 1.83

> 68

> 127

28-39

99

> 2.51

> 75

> 138

28

98

1.89

69

128

29

99

2.46

75

137

26-30

99

> 1.83

> 68

> 127

28-39

99

> 2.51

> 75

> 138

29

99

2.13

71

132

30

99

> 2.46

> 75

> 137

26-30

99

> 1.83

> 68

> 127

28-39

99

> 2.51

> 75

> 138

30

99

2.38

74

136

30

99

> 2.46

> 75

> 137

N

64

N

109

N

204

N

137

Mean

18.31

Mean

17.39

Mean

20.21

Mean

19.38

SD

3.660

SD

3.829

SD

4.120

SD

3.913

Median

18

Median

17

Median

20

Median

19

Skewness

0.048

Skewness

−0.045

Skewness

−0.378

Skewness

−0.125

Kurtosis

−1,023

Kurtosis

−0.456

Kurtosis

0.340

Kurtosis

−0.380

Range

12-25

Range

9-27

Range

6-30

Range

10-29